In my opinion, I think we will be stuck in one price or maybe worse we will all go down.
Here is what happened when US citizens are saving too much.
Check it out here
First of all Bitcoin is like a money it also use for paying that something you need in life, how could you do your daily activities without using any expenses? economy is already there it can not grow without any supporting by spender but we can admit ourselves that all daily routine are level there are spender together with the economic grow.
Ok! when we say "If no one spends bitcoin what might happen" if the dollar is there, the fiat money is there, everything is normal but the Users of Bitcoin are disappointed and discourage because all the time they spend their time to wait the price become high for their ambition to reach a huge profit from bitcoin is not worth it.